I belong to a guild and was aprehensive at first and some ofthe ladies do absolutely beautiful work. Thought mine were lacking. Finally worked up the nerve to show my Christmas quilt I did with quilting and machine embroidery and they loved it much to my surprise. We have a few 'loud ones', but the other ladies are good at discouraging this kind of behavior.
It's too bad this person is so negative, and I agree with Shadow Dancer to ignore her and to not let her ruin the experiance for you. But I tend to agree a bit more with Moonpi as I am so not a people person either and would be rude to her and invite her to do unladylike things to herself. Then promptly leave.
Good Luck.